536 



injurious. It is not conspicuous, as it occurs on the lower surfaces of 

 the leaves and prefers shady situations. It occurs in the hills and is 

 more common in the wet than in the dry season. 



Rkvxe (A.). Verslag van den Entomoloog. [Entomologist's Report.] 

 — Verslag Dcpt. Landbojnv in Suriname, 1920, Paramaribo, 1921, 

 pp. 20-31. 



In the wild cacao area discovered in 1920 [R.A.E., A, ix, 195] the 

 only plantation pests found were a leaf skeletoniser, Zetesima ihcobromae, 

 Busck, and a white scale, Psetidococcus sp. 



In virgin forests Coccus {Lecanium) viridis, Green, was found on 

 Carpotrocha, and was there visited by the same ants, Cremasiogaster, 

 as in the plantations. The coffee ant, Dolichoderus bidens, Latr., 

 occurred on Psidinm and other plants. The coffee thrips, Heliothrips 

 haemorrhoidalis, was found on Bixa sp., and the cacao thrips [Helio- 

 thrips rubrocinctus] on Psidinm polycarpon. 



The experiments in combating the cacao thrips by spraying with 

 milk of lime [R.A.E., A, viii, 440] gave good results in the case of 

 young plants sprayed two or three times. With older plants the results 

 were less satisfactory. In the previous experiments stress was laid 

 on preventive spraying, but in one case such spraying in August and 

 September proved of little use ; the outbreak began in mid-November 

 and reached its climax in December. In this instance one application 

 when the thrips appeared would have been more satisfactory than 

 the two preventive ones. 



It has been found that leaves that are well covered with lime remain 

 free from infestation. Kaolin has given good results as a substitute 

 for lime. The solution is a very fluid one, and it remains to be seen if 

 the resultant thin coating on the lower surface of the leaves will afford 

 as much protection as lime. One great drawback of kaolin is the 

 difficulty of distinguishing sprayed from unsprayed plants. 



Tests with some samples of carbolineum plantarium showed that 

 an 8 per cent, solution did not kill the green coffee-scale [Coccus 

 viridis^, but an 8 per cent, solution of a sample of fruit-tree carbolineum 

 killed 90 per cent, of the scales ; it is, however, very expensive. 



Other insect pests observed in 1920 were : — Colaspis sp. and other 

 leaf-eating beetles on cacao ; Castnia daedalus, Cr., on coconuts ; 

 Aspidiotus destructor, Sign., on coconut (palms sprayed with 6 per cent, 

 carbolineum were killed, but Coccinellids ultimately mastered the 

 infestation and the coconuts recovered by the end of the year) ; 

 and Dolichoderus ftirf^«s, Latr., which was effectively checked b}^ carbol 

 emulsion. 



Demerara green-heart [Nectandra rodioei] is a timber known to be 

 proof against the ship-worm, Teredo navalis, L., so that the destruction 

 of sluice gates made of this wood led to an investigation, which showed 

 the trouble to be due to a species since described as Teredo ( Neoteredo) 

 reynii. This has also been found in the timber of Dimorphandra 

 excelsa in a dismantled bridge. 



Zanon (V.). La " Saturnia cyntJiia " divenuta polifaga. [S. cynthia 

 now a polyphagous Species.] — Riv. Agric, Parma, xxvi, no. 36, 

 9th September 1921, pp. 511-512. 



Saturnia cynthia, imported into Europe from China and Japan 

 shortly after the introduction of Ailanthus glandnlosa, until recently 

 has only been noticed on that tree. In October 1920 the author 



